Excel 2003 Vba Error Handling
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three flavors: compiler errors such as undeclared variables that prevent your code from compiling; user data entry error such as a user entering a negative value where only a positive number is acceptable; and run time errors, that occur when VBA cannot correctly execute a program statement. We excel vba error handling best practice will concern ourselves here only with run time errors. Typical run time errors include attempting to access
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a non-existent worksheet or workbook, or attempting to divide by zero. The example code in this article will use the division by zero error (Error excel vba error handling type mismatch 11) when we want to deliberately raise an error. Your application should make as many checks as possible during initialization to ensure that run time errors do not occur later. In Excel, this includes ensuring that required workbooks and worksheets are present excel vba error handling 1004 and that required names are defined. The more checking you do before the real work of your application begins, the more stable your application will be. It is far better to detect potential error situations when your application starts up before data is change than to wait until later to encounter an error situation. If you have no error handling code and a run time error occurs, VBA will display its standard run time error dialog box. While this may be acceptable, even desirable, in
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a development environment, it is not acceptable to the end user in a production environment. The goal of well designed error handling code is to anticipate potential errors, and correct them at run time or to terminate code execution in a controlled, graceful method. Your goal should be to prevent unhandled errors from arising. A note on terminology: Throughout this article, the term procedure should be taken to mean a Sub, Function, or Property procedure, and the term exit statement should be taken to mean Exit Sub, Exit Function, or Exit Property. The term end statement should be taken to mean End Sub , End Function, End Property, or just End. The On Error Statement The heart of error handling in VBA is the On Error statement. This statement instructs VBA what to do when an run time error is encountered. The On Error statement takes three forms. On Error Goto 0 On Error Resume Next On Error Goto
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harder. Sounds like non-sense? Well I dare say developers spend more time debugging code than writing it. Looking for errors is what developers do most of the time! A critical part of debugging is proper error handling (VBA error handling in our case). http://www.cpearson.com/excel/errorhandling.htm Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it. โ Brian W. Kernighan However, today I don't want to expand on debugging VBA. That I covered in this post. No - today let's learn how to properly handle errors The Mouse Trap Analogy What is error handling? Take this analogy: Say you have a mouse (an error) in the house which turns http://analystcave.com/vba-proper-vba-error-handling/ up every now and then in the least expected moment as slips from your hands (an uncaught exception if you prefer). Without knowing where the mouse is and when it (the exception/error) will appear (in which line of code) you would need to search entire house to catch it (run through the entire code in our case). Obviously a better approach is setting mouse traps in several critical places in the house (corridors etc.) and waiting for the mouse to fall into your trap. So what is our mouse trap when speaking about VBA error handling? The On Error do this statement! Using VBA On Error The VBA On Error statement - tells VBA what it should do from now on, within the vicinity of the current block of code (Function or Sub), when an error/exception is raised. It is like setting a mouse trap - with the difference that you can tell it to drop the mouse off the dumpster or put it in your hands to manage. Let's remind the full syntax of the On Error statement in VBA first: On Error { GoTo [ line | 0 ] | Resume Next } Directly from MSDN we learn the different VBA error handling options we have with the On Error statement: On Error Goto - or On Error GoTo [ lineLabel | 0 | -1 ] if preffered. The Goto instruction in VBA let's you do a jump to a specific VBA code line number to follow through with error handling or s
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and http://stackoverflow.com/questions/1038006/good-patterns-for-vba-error-handling policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags http://www.excelfunctions.net/VBA-Error.html Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only vba error takes a minute: Sign up Good Patterns For VBA Error Handling up vote 47 down vote favorite 30 What are some good patterns for error handling in VBA? In particular, what should I do in this situation: ... some code ... ... some code where an error might occur ... ... some code ... ... some other code where a different vba error handling error might occur ... ... some other code ... ... some code that must always be run (like a finally block) ... I want to handle both errors, and resume execution after the code where the error may occur. Also, the finally code at the end must ALWAYS run - no matter what exceptions are thrown earlier. How can I achieve this outcome? exception vba exception-handling share|improve this question edited Apr 15 '13 at 8:22 Atif Aziz 23k145165 asked Jun 24 '09 at 12:17 jwoolard 2,51062534 add a comment| 9 Answers 9 active oldest votes up vote 69 down vote accepted Error Handling in VBA On Error Goto ErrorHandlerLabel Resume (Next | ErrorHandlerLabel) On Error Goto 0 (disables current error handler) Err object The Err object's properties are normally reset to zero or a zero-length string in the error handling routine, but it can also be done explicitly with Err.Clear. Errors in the error handling routine are terminating. The range 513-65535 is available for user errors. For custom class errors, you add vbObjectError to the error number. For not implemented
are:Compile Errors;Runtime Errors;Logical Errors ('bugs'). These three VBA error types are discussed in turn, below.Compile ErrorsAuto Syntax Check OptionThe Auto Syntax Check option causes a message box to pop up whenever a syntax error is typed into the visual basic editor.If this option is switched off, the visual basic editor still highlights syntax errors in red.The Auto Syntax Check option is accessed by selecting Tools→Options from the menu at the top of the visual basic editor.Compile Errors are recognised by the VBA compiler as being illegal and therefore, are highlighted as errors before your macro even starts to run.If you type in a syntax error, the VBA editor will immediately highlight this, either by popping up a message box or by highlighting the error in red, depending on the setting of the Auto Syntax Check option (see rightabove).Alternatively, a compile error may be detected when the code is compiled, just before being executed.A compile error is generally easy to fix, as the VBA compiler pops up a message box, which provides information on the nature of the error.For example, if you get the message "Compile error: Variable not defined" when you attempt to run your code, this indicates that you are attempting to use, or access, a variable that has not been declared in the current scope. (This error is only generated when you are using Option Explicit). Runtime ErrorsRuntime errors occur during the execution of your code, and cause the code to stop running. This type of VBA error is also relatively easy to fix, as you will be given details of the nature of the error, and shown the location where the code has stopped running.For example, if your code attempts to divide by zero, you will be presented with a message box, which states "Run-time error '11': Division by zero".Depending on the structure of your VBA project, you may be given the option to debug the code, (see below). In this case, clicking on the Debug button on the debug message box, causes the line of co